共查询到19条相似文献,搜索用时 105 毫秒
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本文通过逆止托辊研制的目的、研制的方案以及可行挫等方面,阐述了逆止糙辊在煤矿的应用情况及使用效果。 相似文献
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本文介绍了用于DPSK调制的DS扩频信号非相干检测的一种SAW器件的设计方法。对所研究的差分延迟功能均集于单一器件中。因为没有采用独立的延迟线,故消除了带限影响,DPSK解调器延迟支路无插入损耗。 相似文献
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The present study examines the effect of using a mobile device on search and evaluation by a shopper in a brick-and-mortar store. A conceptual model that proposes inter-relationships between shopping goals, the amount and type of in-store mobile device use, and purchase outcomes is developed. Data from a national quota sample of 1034 mobile shoppers is used to test hypotheses derived from the proposed model. The findings provide several new insights into the impact of in-store mobile device use on the consumer decision journey in a brick-and-mortar store. Depending upon the shopping goals of the consumer, the use of a mobile device by shoppers in a brick-and-mortar store can either decrease or increase search, lead to more deferred purchases or in-store-now purchases, and more online or physical store purchases. The study is among the first to model the pathway to purchase for mobile device assisted shoppers in brick-and-mortar stores. 相似文献
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本系统是针对简易旋转倒立摆而设计的自动调节装置,使用12C5A60S2单片机控制L298驱动进而控制直流电机。使摆杆处于动态平衡的装置。通过角度传感器采集摆杆的状态数据,实时调整直流电机的转向和转速,以调整摆臂的角度,使摆杆恢复到动态平衡状态。在非平衡状态下,通过角度传感器的实时检测,能够通过功能键设计,使摆杆能稳定到一定的角度。 相似文献
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气垫式皮带机相比托辊式皮带机具有能耗低、运行稳定可靠等优点,但较长距离的气垫式爬坡皮带机长期运行后会出现沿线撒漏料现象,影响作业质量。本文结合气垫式皮带机设计原理和结构,对气垫式爬坡皮带机出现撒漏料的各种原因进行了探索和思考,并作出尝试性的维修解决方案,力求解决这一设备运行难题,力争使气垫式爬坡皮带机撒漏料程度降到最低。 相似文献
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本文描述一种改进型场效应管(M—FET)电路。它具有类似FET管的特性,且在热稳定性、频率响应以及大动态范围转移特性的线性化方面均有很大的改进。该电路广泛用于设计线性测试设备系统中的放大器和振荡器。M—FET电路可作为三端器件生产。 相似文献
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Mental models and cognitive maps have been used in college business education as an instructional design technique, assessment tool, and learning strategy. The authors propose a novel use of mental models and cognitive maps as a device to elicit students’ challenges in learning the domain knowledge of a course. Such usage is illustrated in a management information systems course. This student-focused approach can help instructor to better understand students’ learning challenges and enhance teaching effectiveness. 相似文献
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《Business Horizons》2016,59(6):615-622
Wearable computing devices promise to deliver countless benefits to users. Moreover, they are among the most personal and unique computing devices of all, more so than laptops and tablets and even more so than smartphones. However, this uniqueness also brings with it a risk of security issues not encountered previously in information systems: the potential to not only compromise data, but also to physically harm the wearer. This article considers wearable device security from three perspectives: whether the threat is to the device and/or the individual, the role that the wearable device plays, and how holistic wearable device security strategies can be developed and monitored. 相似文献